JPH0733128B2 - Energy recovery of adiabatic engine and vehicle drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulation engine for recovering heat energy of a heat insulation engine having a combustion chamber of an internal combustion engine as a heat insulation structure and driving a vehicle by the recovered energy, and a vehicle drive device.

[0002]

2. Description of the Related Art A heat insulating material is used for a combustion chamber of an internal combustion engine and its related parts, and the exhaust energy of a so-called adiabatic engine, which does not use a cooling mechanism and keeps the engine at a high temperature, is recovered to obtain a driving torque of a vehicle. In order to increase the engine output, it is necessary to guide the exhaust gas of high temperature to a turbine generator etc. to recover the thermal energy as electric power and supply the recovered electric power to the electric motor connected to the crankshaft to drive the electric power. Energy recovery systems are used.

[0003]

In the exhaust energy recovery system for an adiabatic engine as described above, the exhaust temperature is high when the engine has a high load and the recovery efficiency is good as shown in FIG. 6, but the load is low. Occasionally, the exhaust temperature decreases and the recovery efficiency decreases. Since the engine load fluctuates over time during normal traveling of the vehicle as shown in FIG. 7, the average during all traveling also includes an area where exhaust energy cannot be recovered as shown in FIG. Efficiency will be reduced.

The present invention has been made in view of the above problems, and an object thereof is to recover the energy of an adiabatic engine in which the engine load is constantly operated so as to improve the energy recovery efficiency. And to provide a vehicle drive device.

[0005]

In order to achieve the above object, according to the present invention, a power storage means for storing power from the energy conversion means, and power reception from the energy conversion means or the power storage means. Energy recovery of an adiabatic engine and a vehicle drive device including a wheel driving unit that operates and a driving control unit that operates the adiabatic engine in a predetermined high load state and operates the aforesaid wheel driving unit when the vehicle load exceeds the engine load. Will be provided.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of the energy recovery of an adiabatic engine and a vehicle drive device according to the present invention, and FIG. 2 is a block diagram showing an example of its configuration.

In these drawings, 1 is an engine,
For example, it is a so-called adiabatic engine that uses a heat-resistant heat insulating material for the cylinder liner, piston head, intake and exhaust valves, exhaust passages, etc. to insulate the combustion chamber, and exhaust gas that is discharged while maintaining a high temperature. Is guided to the turbocharger 2 via the exhaust pipe 11, and the energy thereof drives the turbine 21. Then, the compressor 22 directly connected to the turbine shaft is rotationally driven, and the compressed air is pressure-fed to the engine 1 via the intake pipe 12 to increase the engine torque.

3 is a generator mounted on the turbine shaft,
Exhaust energy is recovered as electric power, and the generated AC power is converted into DC by the power converter 4, and is directly connected to the four wheels 7 by charging the battery 5 and being controlled by the power controller 6. Motor 71,7
The wires 2, 3 and 74 are electrically connected.

Reference numeral 8 denotes a controller, which is composed of a microcomputer and is provided with a central control unit, various memories, input / output circuits, and the like. The input circuit includes an accelerator pedal depression amount sensor 91, an engine 1 speed sensor 13, When the vehicle speed sensor 14 and the like are connected and the signals from these sensors and the signal of the output voltage of the generator 3 are input from the power converter 4, the output circuit issues a command to the power controller 6. The electric power supplied to the motors 71, 72, 73 and 74 is controlled to urge the vehicle running under load.

Next, the operation of this embodiment thus constructed will be described.

While the vehicle is traveling, the traveling load changes greatly with the passage of time, but the engine is always operated so as to be in a predetermined high load state, and the load on the wheels is small due to signals from various sensors. In this case, regenerative electric power from the generator 3 is supplied to the battery 5 to charge it, and when the load on the wheels is higher than a predetermined value, the motors 71 to 7 are charged.
The recovered electric power and the electric power from the battery 5 are supplied to the motor 4 to drive the motor 4, thereby coping with the high load.

Therefore, as shown in FIG. 3, the engine load is operated at a constant high load state, and the exhaust temperature of the engine exceeds the dashed line energy recovery area line shown in FIG. 4 after a lapse of a predetermined time from the start. Recovery is good.
It should be noted that FIG. 5 is a diagram showing an example of a state in which recovered electric power is supplied to and energized to the motors mounted on the wheels when the load of the vehicle is at a peak.

Although the present invention has been described with reference to the above-described embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0015]

As described above, according to the present invention, the adiabatic engine is constantly operated in a predetermined high load state to discharge the exhaust gas having a high temperature, and the generator is driven to recover it as electric power. When the wheel has a small load, it is stored in the battery,
Also, when the load is heavy, the motor directly connected to the wheels is supplied with the recovered power from the generator, or the power from the battery is energized to energize the motor, so that the engine is always operated in the energy recoverable area to recover the energy. There is an advantage that efficiency is improved and engine consumption is reduced in the entire traveling range.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of energy recovery of an adiabatic engine and a vehicle drive device according to the present invention.

FIG. 2 is a block diagram showing an example of the configuration of this embodiment.

FIG. 3 is a drawing showing a state of engine load in the present embodiment.

FIG. 4 is a drawing showing a state of exhaust temperature in the present embodiment.

FIG. 5 is a diagram showing a relationship between a vehicle load and electric power supplied to a motor in the present embodiment.

FIG. 6 is a diagram showing a relationship between engine load and energy recovery efficiency.

FIG. 7 is a diagram showing an example of changes in engine load over time.

FIG. 8 is a diagram showing a relationship between a change in exhaust temperature and an energy recovery region in a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Turbine 3 ... Generator 4 ... Electric power converter 5 ... Battery 6 ... Electric power controller 8 ... Controller 71-74 ... Motor

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F02B 37/00 302 B 9332-3G

Claims (2)

[Claims] 1. An energy conversion means for converting exhaust energy from an adiabatic engine into electric power, a power storage means for storing electric power from the energy conversion means, and an electric power received from the energy conversion means or the power storage means to operate. Energy recovery of the adiabatic engine, characterized by comprising: wheel driving means for operating the adiabatic engine and operation control means for operating the adiabatic engine in a predetermined high load state to activate the wheel driving means when the vehicle load exceeds the engine load. And vehicle drive. 2. The energy recovery and vehicle drive system for an adiabatic engine according to claim 1, wherein the wheel drive means is a motor connected to wheels.